The possibility and efficiency of the separation of the grain mixture depends on the degree of overlapping of the distribution range of the rate of motion of seeds of the main crop and the particles of impurities. The objective of the research is to create a small seed separator-sorter on the basis of efficient working elements that meet modern technical and technological requirements and tasks of primary seed production. The task of the research is to identify principal advantages and disadvantages of existing technologies, equipment and processing equipment for cleaning grain mixtures of plant seeds in order to substantiate promising technical solutions of the working elements of the separator-sorter of seed material. While cleaning seed material, the main requirement is to remove the quarantine weed seeds completely.